Frictional driving device.



W. J. HARDY.

FRIOTIONAL DRIVING DEVICE.

APPLICATION FILED JUNE 10, 1911.

&

Vi/29534951" 2 we 1? i011" Wiiiz'am Jfiarajy.

Patented Sept. 24, 1912.

' To all-whom it may concern:

' crating some implement, and particularly parts.

WILLIAM JAMES HARDY, OF HIGH. ERIDGE,

s on,

NEW JERSEY, ASSIGNOB, BY DIRECTAND MESNE ASSIGNMENTS, TO TAYLOR IRON & STEEL COMPANY, 015 HIGH BRIDGE, NEW JERSEY, A GORPORATIQN OF NEW JERSEY.

FRICTIONAL DRIVING DEVICE.

Be it known that I, WILLIAM J. HARDY, a citizen of the United States, residing in High Bridge, in the county of Hunterdon and State ofNew Jersey, have invented certain new and useful Improvements in Frie tional, Driving Devices, of which the following is a specification This improvement relates to frictional driving apparatus for transmitting power from a driving shaft or motor shaft for opthe flexible shafts which are employed in dressing off, by means of grinding wheels, castings and other manufactured articles in foundries and other industrial establishments. In this class of work the duty to which any device of this class is necessarily subjected, is of the severest character-so that in practice it is desirable to provide means whereby not only the working or driving parts will be efiectively rotected, but also that the adjusting or riction regulating devices will be equally well protected and at the same. time be readily accessible.

In practice, especially in the kind of work above specified, the speed of rotation of the device will be relatively high, often running up to several. thousand revolutions per minute. Where the work to be ground or trued up is of such a highly refractory nature, such as infanganese steel or the like. and the work of grinding is connnenced upon the rough casting, there are formed upon the faces in such castings protuberanees' here and there which sometimes catch the grinding wheel and almost entirely it not quite stop the same, and due to the above mentioned high speed, damage is apt to be done to the tool or to the source of motive power, which may be electric motor or other con venient means for the purpose. It is obvious that this safety clutch device may be used in any place where an over-load let-otl' is requiredrbetween the source of power and the actuatingineans.

A further improvement in my device is an arrangement of parts whereby the frictional holding capacity may be increased or decreased by adjustment of the contained In the drawings accompanying and forming a part of this specification, Figure 1 is a sectional view of my device taken on the line Specification of Letters latenn Patentedsept, 24, 1912, Application filed June 10, 1911. Serial No. 632,399.

l ---2, Fig: 2. Fig. 2 is a front elevation of" my device.

In Fig. l is shown the main shell or body portion 2 into the. smaller end of which is hole theret-hrough which is in close fitting engagement with the shaftmember it. The shaft member 4 has adisk-like portion 3 on the opposite fiat sides oi? which are placed frictional members or disks 7 and 8. An extension 16 of the shaft storms a support for the frictional member 8, thus preventing the disk from dropping out of position and rubbing against the inner wall of the shell Between the back wall oi. the shell 2 and one face the friction disk 8 is placed a helical spring 6 of the proper proportions to produce the desired amount offrict-ion between the friction disks 7 and 8 and the disk of shaft 4. At the front interior of the shell member 2 is provided a thread'to receive the threaded disk members 9 and 10.

These members are used to increase or de member of the pair and member 9 forming a lock-nut therefor.

For suitably providing for the centralizing of the spindle a a rotating fit is made between said spindle a. and the bore 20 in the cap 1. The tension adjusting members 9 and 10 also form a portion of the centralizing support for spindle a. In the construction as shown it is possible to eliminate one of: the friction disk members but experience has proved the present construction to be more advantageous.

In the cap 1 will be noted a pair offholes 11 and 12, and extensions of these holes (not necessarily in alinement) are placed in the tension adjusting members 9 and 10. It will -he noted, however, that these holes do not the above mentioned :members by use of a wrench ofthe well known pin spanner type.

The purpose of having the :holes in the ten-- sion members 9 and 10 running through member 9 and part way through member 10 is for permitting ,the introduction of the spanner lwrench and by proper manipula tion engage both members 9 and 10 to adjust them forward and backward. The spanner then may be partly removed and the member 9 locked against member 10' independently and the cap member 1 locked finally. y 1n the wall of the shell 2 is provided a small oil'plug l3'for the purpose of providing an entrance into the-chamber 14 for the introduction of lubricant. This chamber may be filled with the proper'amount. of lubricant and the plug replaced,- there being no possibility of escape of the lubricant. This. is one of the reasons Why the spanner holes 11 and li are not allowed to extend.

thro'ugh tension member 10, another reason being to keep out the particles of dust produced in the grinding during the operation of the same.

It will be noted in the drawings that a space 21 is shown between the'inner wall of the shell 2 and the peripheries of the friction members 7, 8, and 3; this is for the purpose of permitting freedom of action and obviating any possibility, during turning has movement, of the biting or sticking of the said disks 7 and 8, thus defeating the object for whichthis device is intended.

In practice it is deemed preferable to inwardlyextend a portion of the member 2 for forming a hub or projection 15 around which the spring 6 at the rear end thereof is located; but this feature may evidently be modified. Should it' be required in some cases to employ a spring, 6, of considerable length, then the extension of the hub poragainst one of said friction rings, a pair 0 a cover on said housing having a bore thereextension of said shaft projecting therefrom, a pair of friction rings mounted upon said one end of said sp'ringbearing against the housing, the other end of said'sprmg bearm v threaded adjusting eolla'rs arranged opposite the spring en'd of said housing, said collars adapted to be adjustedto' and fro insaid housin and locked at will, said collars so' loeated and arranged as to create a pressure mit' the frictional pressure between said friction rings and disk'to be varied at will, the said friction disk being advanced to and from thesaid friction spring member, and

in, the same bei'ng adapted to support and maintain the said transmission shaft in.

operating alinement.

. """WILLIAMJAMES HARDY. Witnessesa 1 1 v 1 EDWIN-I). TIMINUs, 3 h;

A. B. VALENTINE.

1 having thereon a disk member, said, disk; memberbemg located away from the end of said transmission shaft thereby leaving an a transmission shaft, one on each side ofthe said friction dusk, a spring in s'ald housing,

on the other said friction ring and to per- 

